Bag-cutting machine



May s, 1923.

l. C. H OWLETT BAG CUTTI NG MACHINE Filed Jan. 3, 1922 affozneij May 8, 1923.

l. C. HOWLETT BAG CUTTING MACHINE Filed Jan. 5, 1922 2 Sheets-Sheet 2 Patented May 8, 1923.

' UNITED STATES Isaac o. HowLE'r'r, orfBAnGs, TEXAS.

P A fc BAG-CUTTING MACHINE.

Application ined January? 3, 1922; serial No. 526,691.

To @ZZ 'whom' it may concern:

Be it known that' ISAAC C. HowLE'rT, a citizen of the United States of America, re-

siding at Bangs, in the county of Brown and' State of Texas, has invented new and useful Improvements in BagiCutting Machines7 of which the following is a specification.`

The object of the invention is'to provide simple and efficient means for cutting the material usedy for shipping sacks at .the prop-y A Figure 1 is a `view of a sack cutting machine embodying the invention. f y

Figure 2 is an end view thereof.

Figure 3 is a rear view.

Figure 4 is a detail view partly in section of the clutch mechanism for controlling the operation of the movable knife.v

Figures 5, 6,and l7 are detail views of members of the clutch. f

Figure 8 is an enlarged view of a portion of the shiftable member lof the clutch to show the shipping or cam groove thereof.

Figure 9 is a detailsection on the plane indicated by the line 9-9 of Figure 5.

Carried by a suitable frameworklO'are the fixed and movable complementalvknives 10aand 11 of which the latter is supported by links 12 and 13 to 'eect a swinging movement thereof and 'hence a shear cut with relation to the `lower blade and `.is yieldingly supported in its elevated or inoperative position by a-spring 14.v In rear of the plane of these blades are the feed rollers 15 and 16, one or both of which maybetoothednor provided with spurs =or pegs for effectively engaging the material; the upper roller be-'k ing movably supported by means of links 17' andvheldby gravity or otheryielding force in operative relation with the lower roll,`the` material for the sacks beingsupplie'd infthe form'of 'rolls or bolts indicated at 18`andl held in proper position for feeding the material tothe feed roolsby `means of bolt'l i turnedt'erminal spurs '20 forming trunnions for engagement with the ends of the roll or.

bolt of materialand supported by swinging links 21. "The inner ends of said bars are connected by links 22 witharack bar23 which furthermore is slotte-d as shown at 24 to receive a .guide pin 25 at the intersection of the bars 19. Obviously by the vertical movement ofv the rack bar, due to thetoggle connectionutherewith of the bla-rs19, the jaws may b eoperated to cause engagement with l or bolt. i The o-r disengagementfrom the ro stopper wheel 2G is arrangedto engage with said Vrack bar vand is carried by ashaft 27 having a crank arm 28f5and ratchet mechanism 29 by which. the rack barmay be held in adjusted'positions.

The Operation of the movable 'blade ,is fi fected by means of abell-crank lever 30jzof i which one armis represented by the link 13, and a--'pitman 1n connected with a. crank wheel 32 loosely mounted yupon the drive 1 shaft which is adapted to. be` continuously driven through power appliedv by means of the belt wheel 34. Thel crank wheely or disk.

32 carries a sleeve 35 having a clutch meme-- ber 36 which isy adapted for engagement by a shifting clutch member 37- also loosely mounted onthe shaft 38 and having an actu-l ating .spring38 serving to impelthesame towardv or `into engaging relation withthe clutch member' 36. Fixed to the drive shaft yisa supplemental clutch member 39 foren- 'gagement with which the"y shiftingclutchY member 37 is provided -with Ya clutch'face 40,-

so 'that when-the shifting-.clutch member vis engaging relation with the'ixed .clutch member 39 so as to'receiveinotion from theshaft, 'itis als() in interlocking engagementk with the clutch member'BG to communicate mof tion to the crank disk and `hence'thro-ugh the pitman` and bell-crank orrocker B0 to the movable cutter barror knife which is mov` i yable to its operativebr cutting position in belt 42-tra'versing a pulley 43 on the' drive 'f sha-ftan'd one of the respectively fast 'and loose pulleys'44 on the countershaft under the control of a belt shifter45, andthrough intermeshing beveled gears=46 '-motion communicated from 'said countershaft to the lower feed roll 15. t

The shifting clutch member 37 is provided, as will be seen more clearly by reference to Figures 5 and 8, with a cam groove 47 extendingv peripherally and for a portion of its distance spirally thereof, with the longitudinally deflected or spiral portion 48 thereof arranged in overlapping relation with the initial end 49 and with a depressed bottom or floor as shown at 50 between which and the floor of the initialend of the groove is arranged a shoulder 51. Operating in this groove isa key 52 carried by-a trigger 53 which is pivotally mounted at 54 and is of bell-crank form with a trip arm 55 arranged in the pathof an armed trip 56. y

lVhen the shifting' clutch member is in its closedr position or is in engagement with the clutch members 36 and 39 tol lock the latter to theV drive shaft and thus communicate motion to the movable knife blade, the key 52 is arranged in the cam groove and follows the groove until the spirally deflected portion thereof by cont-act with the key moves the shifting clutch member longitudinally of the shaft against the pressure `of 4the spring`38 to effect the disengagement of Vthe clutch faces. This disengagement occurs and therefore the motion of the cutter blade 'ceases when the crank disk has made one complete revolution. The trigger which carries the key 52 iskactuated by a spring 57 tending to hold the key ydownward in the groove, and therefore the key follows the inwardly deflected bottom of the groove at the end thereof and serves by engagement with the shoulder 49 to hold the shifting-clutch member in the reversed position in lopposition tothe spring 38.

The spindle 58 of the trip 56 carries a worm gear 59 engaged by a worm 60 on the lower or main feed roll, so that'as'the latter -turns and thereby feeds a definite length of the sacking material through the plane of the cutter knives, it communicates motion throughfthe worm and gear to the trip 56 and when the arm of the latter strikes thek triparmk of the trigger 53 lit i cam groove and at the end of a revolution of the drive shaft the clut-ch member is again withdrawn from engagement by the action of the key on the spira-Hy deflected wall of said groove to discontinue the movement of -the cutter mechanism and permit a further length ofthe sacking material to be fed between the blades thereof.

A spring actuated tensioning device or brake 61 is arranged for contact with the bolt or roll of sacking material to prevent able in timed relation with said feed roll,k

and consisting of a rotary tappet head geared to the vfeed roll.

2. A machine for cutting a continuous strip of material into specified lengths, having'al feed roll traversed by the material, a cutter mechanism having an intermittently movable member, a rotary driving member, a clutch for connecting the cutter mechanism with the driving member, and clutch shifting means having an actuating element movable in timed relation with said feed roll,

- the clutch having a spring actuated member with a tendency to move to closed position, and the shifting means having a lever engaged clutch retracting cam.l

3. A machine for cutting a continuous strip of material into specified lengths, having a feed roll traversed by the material, a cutter mechanism having an intermittently movable member, a rotary driving member, a clutch for connecting the cutter mechanism with the driving member, and clutch shifting means having an actuating element movable in timed relation with said feed roll, the clutch having a Aspring closed member provided with a spiralV cam, and the 'shifting means havinga key movable radially of the clutch for engaging said cam.

4. lA machinel for cutting' a continuous strip of material into specified lengths, having a feed roll traversed by the material, a cutter mechanism having an intermittently movable member, arotarydriving member,

a clutch for connecting the cutter mechanism with the=driving member, and clutchv shifting means 'having an lactuating element roll,the clutch having a spring closed member providedwith a spiral cam groove with its terminals in `communication longitudinally of the clutch.

5. A machine for cutting a continuous4 strip of material into specied lengths, hav-` ing a 'feed roll traversed by the material, a cutter mechanism having anintermittently movable member, a rotary drivingfmember,

a clutch for connecting the cutter mechanism with the driving member,` and clutch shifting means having an actuating element movable in timed relation with said feed roll,

y.the clutch having a yspring closed member movable in timed relation with said feed provided With a spiral cam groove With its terminals in communication longitudinally of the clutch, a radial stop shoulder being disposed between the terminals of the groove.

6. A machine for cutting a continuous strip of material into specified lengths having a feed roll traversed by the material, a cutter mechanism embodying an intermittently movable member, a rotary driving member, a clutch for operatively connecting the cutter mechanism with the driving member, and clutch operating means embodying a trigger, a trip for engagement with said trigger and operated in timed relation with said feed roll, the lclutch having a spring closed` member provided With a spiral cam groove with its terminals in communication longitudinally of the stock, one extremity of the trigger being operatively engaged in said cam groove.

7 A machine for cutting a continuous strip of material into specified lengths having a feed roll traversed bythe material, a

cutter mechanism embodying an intermittently movable member, a rotary driving member, a clutch for operatively connecting the cutter mechanism With the driving member, and clutch operating means embodying a trigger, a trip for engagement with said trigger and operating in timed relation with said feed roll, the clutch having a spring closed member provided With a spiral cam groove With its terminals in communication longitudinally of the stock, one eX- tremity of the cam groove being depressed to a lower level than the connecting extremity to provide a radial stop shoulder, the trigger having a key traversing said cam groove 'and engageable with said shoulder for the purpose specified.

In testimony whereof he aflixes his signature. i

ISAAC C. HOWLETT. 

